That said, today I downloaded the Yahoo User Interface library (YUI) and started working on tabsets for a client for whom I’m doing an interface design. I’ve never, ever done anything like this before, but I actually got pretty far. I have three tabsets on my page, I’m about 2/3 of the way done skinning them. I just need to find out if I can apply a background image to the content area because I wanted to have a gradient there. Otherwise, it’s all good so far.